rough colony


Also found in: Medical.

rough colony

[′rəf ′käl·ə·nē]
(microbiology)
A flattened, irregular, and wrinkled colony of bacteria indicative of decreased capsule formation and virulence.
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Actinomyces israelii was identified from findings of Gram-positive extremely fine filamentous forms (see Fig.3), non-pigmented and non-hemolytic irregular rough colony morphology (see Fig.2), Catalase negativity, positive nitrate reduction test, negative urea hydrolysis test, negative Voges-Proskauer reaction and by extended biochemical tests to determine different sugar fermentation (see Table).
[5] described the dry crystalline surface (rough colony morphology) as a positive result, disregarding the color (black or pink).
Cultures were grown overnight on MacConkey agar, and a rough colony was placed in nutrient broth and grown for 18 hours at 37[degrees]C.